It seems that in addition to its primary effect of virtually complete protection against measles, mumps and German measles, the vaccine (if given at the recommended age) conveys a slight, though measurable, resistance to the development of severe asthma. A study in Denmark found that:
a study in Denmark looked at the records of over 800,000 children and found that MMR-vaccinated children were 25% less likely to be hospitalised with asthma than non-vaccinated children, and were also prescribed fewer courses of asthma medicine
Thanks to asthma.org.uk for the information. The report of the study is at http://aje.oxfordjournals.org/content/168/11/1277.full.pdf
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